"Every Republican nominee since 1968 has satisfied one of
three criteria: He's had a family member who'd won the presidency; he's been on
a winning presidential ticket himself; or he's come in second in a prior
nomination season," fivethirtyeight says. "These are admittedly broad criteria,
but Republicans haven't nominated relative unknowns, unlike Democrats with
their Mike Dukakises and Jimmy Carters."